President Barack Obama delivers a statement from Martha's Vineyard, Mass., during his vacation Wednesday. Obama's remarks come after Islamic State insurgents released a video showing the beheading of U.S. journalist James Foley, who has been missing in Syria for nearly two years. (REUTERS/Kevin Lamarque)

President Barack Obama issued a statement today in the aftermath of the beheading of New Hampshire-based journalist James Foley by the extremist group the Islamic State of Iraq and Syria (ISIS or ISIL).

.“Today, the entire world is appalled by the brutal murder of James Foley by the terrorist group ISIL,” President Obama said during a live address from Martha’s Vineyard, Mass., where he resumed his vacation late Tuesday after returning to the White House earlier this week..."No just God would stand for what they did yesterday and what they do every single day. People like (ISIS) ultimately fail. Because the future is won by those who build and not destroy," Obama said.

Obama did not specify on Wednesday if there would be any policy or strategy changes toward how the U.S. will approach and contain ISIS...He did say, however, that the U.S. would continue to remain "vigilant" and "relentless" in the face of threats by the group.

"The United States of America will continue to do what we must do to protect our people. We will be vigilant and we will be relentless," Obama said...The White House's National Security Council said Wednesday that the video of Foley’s murder, released by the ISIS, which has since been removed from YouTube and other social media, is authentic. The video showed a member of the group executing Foley, who was kidnapped in Syria in 2012..."We have reached the judgment that this video is authentic. We will continue to provide updates as they are available," NSC spokesperson Caitlin Hayden said in a statement.

In the video, ISIS also threatened to kill another American journalist it said it was holding captive — Steven Sotloff, who was kidnapped near the Syrian-Turkish border in August 2013...Sotloff had been freelancing for Time and other publications. Sotloff was a 2002 graduate of Kimball Union Academy in Meriden.

The group said it killed Foley as an act of revenge for U.S. intervention in Iraq...Obama authorized the U.S. military to conduct airstrikes in Iraq nearly two weeks ago, in an attempt to aid Iraqi forces against the extremist militants...